STEM与日常科技·英语30篇（2）

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纳米材料与自清洁表面

Self-cleaning surfaces often use titanium dioxide nanoparticles that become photocatalytic when exposed to UV light from sunlight.
These activated nanoparticles break down organic dirt, bacteria, and air pollutants like nitrogen oxides into harmless molecules.
Water sprayed on such coatings forms nearly spherical beads due to superhydrophobicity, rolling off and carrying away dust effortlessly.
Manufacturers embed nanostructures — like microscopic pillars or grooves — into paint, glass, or textiles to create this effect.
Buildings in Tokyo and Rome use nano-coated tiles that stay cleaner for years, cutting maintenance costs and scaffolding needs.
In hospitals, nano-treated fabrics resist stains and microbes, reducing laundering frequency and cross-contamination risks.
Durability remains a challenge: abrasion, chemical cleaners, or prolonged UV exposure can gradually degrade nano-coatings.
Researchers now develop bio-inspired versions mimicking lotus leaves or shark skin to improve longevity and eco-safety.
Regulatory agencies assess nanoparticle release during wear or washing to ensure no harmful accumulation in water or soil.
While not magic, these surfaces demonstrate how precisely engineered materials at atomic scales deliver practical, everyday benefits.